Several Chinese students are expelled from the university. The guys have already decided that a pass to the world of great science for them will forever be closed. But, during this difficult period, they were lucky enough to stumble upon a very unusual signal coming from outer space. Its source is the mysterious and mysterious, "dark" half of the Moon. And the very detection of this sound is already a huge sensation. For a long time it was believed that life on the satellite of our planet is impossible. Nevertheless, in this mystical sound, something really reasonable is encrypted. And friends do not abandon attempts to completely decipher it. But only the long-awaited solution of this phenomenon does not please them at all. After all, as a result, the heroes turn out to be implicated in the insidious plans of hostile people, the Illuminati.